/**
 * renderTaskTreeText / renderTaskTreeMermaid — pure-functional tree renderers.
 *
 * Convert a scoped dependency graph into a human-readable ASCII tree or a
 * Mermaid graph TD block. Both renderers are stateless and produce a string.
 *
 * @arch SDK Tool (Category B) — pure, no side effects, contracts-typed
 * @task T10068
 * @epic T9835
 */
import type { RenderTaskTreeInput } from '@cleocode/contracts';
/**
 * Render a simple ASCII dependency tree.
 *
 * Root tasks (no dependencies within the scoped set) are listed first.
 * Tasks on the critical path are marked with `**`.
 *
 * @param input - Nodes, edges, and critical path
 * @returns ASCII text block
 *
 * @example
 * ```typescript
 * const text = renderTaskTreeText({ nodes, edges, criticalPath: ['T1', 'T2'] });
 * // "Dep tree:\n  [ ] T1: Setup **\n  [ ] T2: Build **\n  ..."
 * ```
 */
export declare function renderTaskTreeText(input: RenderTaskTreeInput): string;
/**
 * Render a Mermaid `graph TD` block.
 *
 * Escapes double-quotes and brackets in task titles to prevent parse errors.
 * Tasks on the critical path are styled with an orange-red highlight.
 *
 * @param input - Nodes, edges, and critical path
 * @returns Mermaid graph TD string
 *
 * @example
 * ```typescript
 * const mermaid = renderTaskTreeMermaid({ nodes, edges, criticalPath: ['T1'] });
 * // "graph TD\n  T1[\"T1: Setup (pending)\"]\n  ..."
 * ```
 */
export declare function renderTaskTreeMermaid(input: RenderTaskTreeInput): string;
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